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          本课时<kbd>讲解代码</kbd>，<code>&lt;section&gt;</code>、用户输入、基本代码块、变量、程序输出
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       <pre>&lt;p&gt;Sample text here...&lt;/p&gt;</pre>
        
        <var>y</var> = <var>m</var><var>x</var> + <var>b</var>
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        <samp>This text is meant to be treated as sample output from a computer program.</samp>
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